Combination-tool.



' UNITED STATES PATENT Fries.

WILLIAM DQARNOT, OF FITCHBURG, MASSACHUSETTS, ASSIGNOR OF ONE- I-IALF TO GEORGE B. LAWRENCE OF SAME PLACE.

COM BlNAT'lON-T OOL.

SPECIFICATION forming part of Letters Patent No. 636,098, dated October 31, 1899.

Application filed May 25. 1899. Serial No. 718,208. (No model.)

To all whom it may concern: a seat for the sliding graduated scale 18.

Be it known that I, WILLIAM D. ARNOT, of This scale is provided with graduations upon Fitchburg, in the county of Worcester and each side a short distance from each longi- State of Massachusetts, have invented a new tudinal edge, so that in using the tool measand Improved Combination-Tool, of which the urements may be taken from either side. A following is a full, clear, and exact descripspring 19 is located within the chamber 17, tion. having bearing upon the top of the sliding The object of my invention is to provide a scale, and a set-screw 20, passed through the tool that may be used as a depth-gage, exterblock 16, engages with said spring, and

10 nal or internal square, a caliper-gage, and a through the medium of the spring and setcaliper-rule. screw the sliding scale may be held in adjust- A further object of the invention is to coned position. struct a tool of the character above described The scale is read at opposite points 21, prothat may be conveniently carried in the duced one in the plate 14. and the other in the 15 pocket. plate 15, and these reading-points are formed The invention consists in the novel conby producing opposing inclined recesses in struction and combination of the several the said plates 14 and 15, as is clearly shown parts, as will be hereinafter fully set forth, in Fig. 2. The end member 12 of the frame and pointed out in the claims. or body is provided at its upper end with an 20 Reference is to be had to the accompanying inward extension 22, the vertical face of which drawings, forming a part of'this specification, extension is opposite the sliding graduated in which similar characters of reference indiscale and is at right angles to the straight cate correspondng parts in all the figures. edge 11.

Figure l is a side elevation of the improved The surface 22 serves as a caliper-tip or an- 2 5 tool. Fig. 2 is a plan view of the tool, one of vil. In caliper-rules and caliper-squares the v the members being in horizontal section, also graduations and reading-points are generally a portion of the graduated scale or slide; and all on what may be known as the backbone Fig. 3 is a vertical section taken substanof the tool. Consequently in calipering an tially on the line 3 3 of Fig. 1. object the tool usually registers less than the 0 The body or frame A of the tool is preferactual measurement. Under the construc- 8o ably made of metal stamped or out from a tion herein shown and described the gradusheet, and usually the said frame or body is ated scale or rule and reading-points are dimade of thin flat steel. The said frame or rectly in line with the object calipered, thus body A consists of a base member 10, having eliminating the variation caused by the jaws 3 5 a straight edge 11 at its bottom, and two end springing in the old caliper-rule, and theremembers 1:2 and 13. Preferably also the infore obtaining better results. Cylindrical obner edge of the frame or body is concaved jects may be calipered to the extreme limit where the end members connect with the base of adjustment by the use of the improved member, and the end member 13 joins the tool, with the added advantage of showing the 40 straight edge 11 of the base member at right measurement of the diameter calipered. The angles. outer end of the sliding scale or rule 18 may Two thin plates 14: and 15 are secured by he used as a depth-gage, and the under edge pins, rivets, or otherwise to opposite sides of of the sliding scale or'rule 18 and adjacent the end member 13. These plates let and 15 straight surface of the end member 13 may 5 extend above the end member 13, as illusbe used as an external square, while the said 9 5 trated in Fig. 3, and the space between the straight outer surface of the end member 13 plates 14 and 15 is closed at the top by an inand straight edge 11 may be used as an interserted block 16, but a space 17 is formed benal square, the calipering being accomplished tween the said inserted block 16 and upper between the tip or anvil 22 and inner end of 5o edge of the end member 13 in order to form the scale or rule 18. I00

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. A combination instrument comprising an approximately U -shaped frame formed of thin flat material and having one of its end members provided with an inwardly-extending caliper-tip or anvil, the other end member having an outer straight edge, and a thin adjustable graduated blade mounted on the member having the outer straight edge and in alinement with the caliper-tip or anvil, substantially as described. v

2. A combination instrument comprising, a frame havin gabase formed withastraightbot tom edge, and two end members, one end member being formed with a straight outer edge at right angles to the bottom edge, and the other member being provided at its end with a caliper-tip or anvil, and a graduated blade sliding in the upper end of the end member having the straight edge and arranged at right angles to said straight edge the said blade being in alinement with the caliper-tip or anvil and adapted to be moved toward or from the tip, or to be projected beyond the straight edge of the end member to form therewith a square, substantially as specified.

3. A combination instrument comprising a frame formed of fiat metal and comprising a base member having a straight edge at its bottom, an end member terminating in an inwardly-extending caliper-tip or anvil, and a second end member whose outer edge is straight and connects at right angles with the straight edge of the base, the said second end member being of less length than the first end member, plates secured to opposite sides of the second end member and extending above the same, and a graduated blade mounted to slide on the top edge of the said second end member and between the said plates, the said blade being in horizontal alinem ent with the caliper-tip or anvil, substantially as described.

WILLIAM D. ARNOT.

Witnesses:

J. E. McCoNNELL, ANDREW CONNERY. 

